#lambeosaurine

[fossilprep]

We've got Spheroolithid eggs (from Lambeosaurine dinosaurs) and bones coming out of our newest egg site "Double Yolk"!

The bones all seem to come from the skeleton of an individual that's about a year old. It's a very uncommon growth stage!

[unclefard]

Parasaurolophus animation test.

Hadrosaurs are often shown in art doing a backwards two-legged kick like a horse in order to defend themselves. However, many of these things were the size of an elephant or larger, and their center of mass was probably closer to their rear than that of a horse (a lot more weight on the back legs). They were facultative bipeds, while a horse is an obligate quadruped. Now there is a video out there of an elephant doing a handstand, so a hadrosaur could possibly briefly hold its weight up just on its forelimbs, but not quickly/efficiently enough to effectively kick.

just putting this out there, completely off-topic, i am by no means a closeted trex glazer. not at all. i love hadrosaurs. some of my favorite dinosaurs are hadrosaurs. i think it's really cool how, uh, they have those... crests... yeah... and the way they, well...uh... hadro their saur and such, so on and so forth. perchance.

That aside they're depicted a lot like scaly horses, which is fair, but there are parasaur fossils that would have been 10+ ton animals in life. They probably did not run/gallop and could at best manage an elephantine fastwalk. They were probably pretty destructive, knocking down trees like elephants do, and making large, frequent poops. Perhaps they were a bit mean, owing to tyrannosaur-induced genetic trauma. I image they'd be fun to watch at a zoo though, as herbivores tend to be more out-and-about then carnivores from what i've seen on zoo trips.

[hasellia]

2026DrawDinoDaily, Day 82, Marchosauria, 22.03.2026

Parasaurolophus Parasaurolophus walkeri

Wah, dino week complete! It's been a while since I did an art challenge & I really enjoyed it! We're ending with a very iconic dinosaur that is very marvellous, parasaurolophus, who can sing a lovely chorus that I'm sure made many birds jealous. I'll stop before I bore us. But yeag, last I heard, we actually have a pretty good idea how this iconic animal sounded! Very trumpet-ey. I can't help but think of Dinosaur King ™ with this dinosaur, too.

I'll do more 2026drawdinodaily prompts that come up when I can. Looking forward to Hoatzin, Butcher bird, Kentrosaurus & Kakapo! See you then!

[strudelsaurus]

[he-who-needs-to-be-silenced]

Have some ornithischians

[actual-haise]

The giant hadrosaurid Magnapaulia browsing apart from it's herd, not bothered at all by a resting tyrannosaur thanks to it's sheer size. With a size of ~12,5m this herbivore is not to be trifled with.

[a-dinosaur-a-day]

Angulomastacator daviesi

By José Carlos Cortés

Etymology: Bended Chewer

First Described By: Wagner & Lehman, 2009

Classification: Dinosauromorpha, Dinosauriformes, Dracohors, Dinosauria, Ornithischia, Genasauria, Neornithischia, Cerapoda, Ornithopoda, Iguanodontia, Dryomorpha, Ankylopollexia, Styracosterna, Hadrosauriformes, Hadrosauroidea, Hadrosauromorpha, HadrosauridaeEuhadrosauria, Lambeosaurinae

Status: Extinct

Time and Place: All we know is that Angulomastacator lived in the Campanian age, so sometime between 84 and 72 million years ago (though it seems to be around 76 million years ago) 

Angulomastacator is known from the Aguja Formation of Texas 

Physical Description: Angulomastacator was a Lambeosaurine - a duck-billed dinosaur with a hollow crest connected to its nose - known from its jaws. Fascinatingly enough, its jaws were weirdly curved downwards, at a 45 degree angle - unusual for a hadrosaur, or really for any dinosaur. As such, it was probably a very highly specialized herbivore. Unfortunately, without more fossil evidence of Angulomastacator, we cannot be certain of the rest of its morphology; what shape its crest may have been, or size of its body, is uncertain. As a Lambeosaurine, it would have been a rather chunky animal, and facultatively bipedal. It probably would have been of moderate to larger size.

Diet: Angulomastacator would have eaten primarily soft plant matter such as ferns and flowers and fruit, but with its downturned jaw it’s uncertain how its diet would have differed extensively from other hadrosaurs; it’s probable that it would have fed on lower lying vegetation than other hadrosaurs, reaching down into a fern and grabbing the leaves while pulling upwards. 

By Ripley Cook

Behavior: Angulomastacator, as a hadrosaur, would have been extremely social, living in very large and complicated family groups. These groups would have cooperatively taken care of their young in large nesting sites. They probably had hollow crests, which would have made distinctive sounds; though the shape of said crest is uncertain. Finally, that crest would probably have been used in display.

Ecosystem: The Aguja Formation represented a coastal plain environment, associated with a muddy transition going from the ocean to narrow river channels. This was an environment filled with many early flowering plants as they grew along the coast. Here there were many other dinosaurs - ceratopsians such as Agujaceratops and Yehuecauhceratops, ankylosaurs like Edmontonia, the pacycephalosaur Texacephale, and another hadrosaur, Kritosaurus. There were also predators such as Saurornitholestes, and omnivores like Leptorhynchos, which would have been dangers for young Angulomastacator. In addition there were turtles and the extremely big crocodilian Deinosuchus which would have fed on adult Angulomastacator as they passed by sources of water.

Other: Angulomastactor is a rare example of a hollow-crested hadrosaur with an interesting feature that isn’t the crest!

~ By Meig Dickson

Sources under the Cut 

Horner, John R.; Weishampel, David B.; Forster, Catherine A (2004). "Hadrosauridae". In Weishampel, David B.; Dodson, Peter; Osmólska, Halszka. The Dinosauria (2nd ed.). Berkeley: University of California Press. pp. 438–463.

Lehman, Thomas M.; Susan L. Tomlinson (2004). "Terlinguachelys fischbecki, a new genus and species of sea turtle (Chelonioidea: Protostegidae) from the Upper Cretaceous of Texas". Journal of Paleontology. The Paleontological Society. 78 (6): 1163–1178. doi:10.1666/0022-3360(2004)078<1163:TFANGA>2.0.CO;2.

Longrich, N.R., Sankey, J., and Tanke, D. (2010) Texacephale langstoni, a new genus of pachycephalosaurid (Dinosauria: Ornithischia) from the upper Campanian Aguja Formation, southern Texas, USA. Cretaceous Research. doi:10.1016/j.cretres.2009.12.002.

Sullivan, R.M., and Lucas, S.G. 2006. "The Kirtlandian land-vertebrate "age" – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America." New Mexico Museum of Natural History and Science, Bulletin 35:7-29.

Spencer G. Lucas, Robert M. Sullivan and Adrian P. Hunt: Re-evaluation of Pentaceratops and Chasmosaurus (Ornithischia: Ceratopsidae) in the Upper Cretaceous of the Western Interior. In: New Mexico Museum of Natural History and Science Bulletin 35 (2006), S. 367-370.

Wagner, J. R., and T. M. Lehman. 2009. An enigmatic new lambeosaurine hadrosaur (Reptilia: Dinosauria) from the Upper Shale Member of the Campanian Aguja Formation of trans-Pecos Texas. Journal of Vertebrate Paleontology 29(2):605-611

Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd ed., Berkeley: University of California Press. ISBN 0-520-24209-2.

[cryptid-1]

A Parasaurolophus tubicen for @a-dinosaur-a-day mod Meig’s mother. She is currently in the ICU, and her favorite dinosaur is none other than the big trumpeter itself!